﻿<?php
/**
 * 分页类
 * @author 
 * @date 2011-06-10
 * 
 * show(2)  1 ... 62 63 64 65 66 67 68 ... 150
 * 分页样式 
 * #page{font:12px/16px arial}
 * #page span{float:left;margin:0px 3px;}
 * #page a{float:left;margin:0 3px;border:1px solid #ddd;padding:3px 7px; text-decoration:none;color:#666}
 * #page a.now_page,#page a:hover{color:#fff;background:#05c}
*/

class page
{
	public     $first_row; 		  //起始行数

	public     $list_rows;  	  //列表每页显示行数
	
	protected  $total_pages;	  //总页数

	protected  $total_rows;		  //总行数
	
	protected  $now_page;         //当前页数
	
	protected  $is_ajax  = FALSE; //是否ajax
	
	protected  $parameter = '';
	
	protected  $page_name;        //分页参数的名称
	
	protected  $ajax_func_name;
	
	public 	   $plus = 3;         //分页偏移量
	
	protected  $url;
	
	
	/**
	 * 构造函数
	 * @param unknown_type $data
	 */
	public function __construct($data = array())
	{
		$this->total_rows = $data['total_rows'];

		$this->parameter  = !empty($data['parameter']) ? $data['parameter'] : '';
		$this->list_rows  = !empty($data['list_rows']) && $data['list_rows'] <= 100 ? $data['list_rows'] : 15;
		$this->total_pages= ceil($this->total_rows / $this->list_rows);
		$this->page_name  = !empty($data['page_name']) ? $data['page_name'] : 'p';
		
		/* 当前页面 */
		if(!empty($data['now_page']))
		{
			$this->now_page = intval($data['now_page']);
		}else{
			$this->now_page   = !empty($_GET[$this->page_name]) ? intval($_GET[$this->page_name]):1;
		}
		$this->now_page   = $this->now_page <= 0 ? 1 : $this->now_page;
		
		
		if(!empty($data['is_ajax']))
		{
			$this->is_ajax = TRUE;
			$this->ajax_func_name = $data['ajax_func_name'];
		}		
		
		if(!empty($this->total_pages) && $this->now_page > $this->total_pages)
		{
			$this->now_page = $this->total_pages;
		}
		$this->first_row = $this->list_rows * ($this->now_page - 1);
	}	
	
	/**
	 * 得到当前连接
	 * @param $page
	 * @param $text
	 * @return string
	 */
	protected function _get_link($page,$text)
	{
		if($this->is_ajax)
		{
			$parameter = '';
			if($this->parameter)
			{
				$parameter = ','.$this->parameter;
			}
			return '<a onclick="' . $this->ajax_func_name . '(\'' . $page . '\''.$parameter.')" href="javascript:void(0)">' . $text . '</a>' . "\n";
		}
		else
		{
			return '<a href="' . $this->_get_url($page) . '">' . $text . '</a>' . "\n";
		}
	}
	
    
    /**
     * 设置当前页面链接
     */
    protected function _set_url()
    {
        $url  =  $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;
        $parse = parse_url($url);
        if(isset($parse['query'])) {
            parse_str($parse['query'],$params);
            unset($params[$this->page_name]);
            $url   =  $parse['path'].'?'.http_build_query($params);
        }
        if(!empty($params))
        {
        	$url .= '&';
        }
        $this->url = $url;
    }
	
    /**
     * 得到$page的url
     * @param $page 页面
     * @return string
     */
    protected function _get_url($page)
    {
    	if($this->url === NULL)
    	{
    		$this->_set_url();	
    	}
  	//	$lable = strpos('&', $this->url) === FALSE ? '' : '&';
    	return $this->url . $this->page_name . '=' . $page;
    }
    
    
    /**
     * 得到第一页
     * @return string
     */
    public function first_page($name = '第一页')
    {
 		if($this->now_page > 5)
 		{
 			return $this->_get_link('1', $name);
 		}	
 		return '';
    }
    
    /**
     * 最后一页
     * @param $name
     * @return string
     */
    public function last_page($name = '最后一页')
    {
 		if($this->now_page < $this->total_pages - 5)
 		{
 			return $this->_get_link($this->total_pages, $name);
 		}	
 		return '';
    }  
	
    /**
     * 上一页
     * @return string
     */
    public function up_page($name = '上一页')
    {
    	if($this->now_page != 1)
    	{
    		return $this->_get_link($this->now_page - 1, $name);
    	}
    	return '';
    }
	
    /**
     * 下一页
     * @return string
     */
    public function down_page($name = '下一页')
    {
    	if($this->now_page < $this->total_pages)
    	{
    		return $this->_get_link($this->now_page + 1, $name);
    	}
    	return '';
    }

    /**
     * 分页样式输出
     * @param $param
     * @return string
     */
    public function show($param = 1)
    {
    	if($this->total_rows < 1)
    	{
    		return '';
    	}
    	switch ($param) {
			case '1' :
				return $this->show_1();
				break;
			case '2' :
				return $this->show_2();
				break;
			case '3' :
				$this->ajax_func_name  = empty($this->ajax_func_name) ? 'toPage' : $this->ajax_func_name;
				return $this->show_3();
				break;
			case '4' :
				return $this->show_4();
				break;
			case '5' :
				return $this->show_5();
				break;
		}
    }
    
    protected function show_2()
    {
        if($this->total_pages != 1)
    	{
    		$return = '';
    		$return .= $this->up_page('<');
			for($i = 1;$i<=$this->total_pages;$i++)
			{
				if($i == $this->now_page)
				{
					$return .= "<a class='now_page'>$i</a>\n";
				}
				else
				{
					if($this->now_page-$i>=4 && $i != 1)
					{
						$return .="<span class='pageMore'>...</span>\n";
						$i = $this->now_page-3;
					}
					else
					{
						if($i >= $this->now_page+5 && $i != $this->total_pages)
						{
							$return .="<span>...</span>\n"; 
							$i = $this->total_pages;
						}
						$return .= $this->_get_link($i, $i) . "\n";
					}
				}
			}
			$return .= $this->down_page('>');
    		return $return;
    	}
    }
	
	protected function show_5()
    {
        if($this->total_pages != 1)
    	{
    		$return = '<a>共'.$this->total_rows.'条/'.$this->total_pages.'页,每页'.$this->list_rows.'条</a>';
    		$return .= $this->up_page('<');
			for($i = 1;$i<=$this->total_pages;$i++)
			{
				if($i == $this->now_page)
				{
					$return .= "<a class='now_page'>$i</a>\n";
				}
				else
				{
					if($this->now_page-$i>=4 && $i != 1)
					{
						$return .="<span class='pageMore'>...</span>\n";
						$i = $this->now_page-3;
					}
					else
					{
						if($i >= $this->now_page+5 && $i != $this->total_pages)
						{
							$return .="<span>...</span>\n"; 
							$i = $this->total_pages;
						}
						$return .= $this->_get_link($i, $i) . "\n";
					}
				}
			}
			$return .= $this->down_page('>');
    		return $return;
    	}
    }
    
	protected function show_4()
    {
		$plus = $this->plus;
    	if( $plus + $this->now_page > $this->total_pages)
    	{
    		$begin = $this->total_pages - $plus * 2;
    	}else{
    		$begin = $this->now_page - $plus;
    	}
    	
    	$begin = ($begin >= 1) ? $begin : 1;
    	$return = '<a>共'.$this->total_rows.'条/'.$this->total_pages.'页,每页'.$this->list_rows.'条</a>';
    	$return .= $this->first_page();
    	$return .= $this->up_page();
    	for ($i = $begin; $i <= $begin + $plus * 2;$i++)
    	{
    		if($i>$this->total_pages)
    		{
    			break;
    		}
    		if($i == $this->now_page)
    		{
    			$return .= "<a class='now_page'>$i</a>\n";
    		}
    		else
    		{
    			$return .= $this->_get_link($i, $i) . "\n";
    		}
    	}
    	$return .= $this->down_page();
    	$return .= $this->last_page();
    	return $return;
    }
	
    protected function show_1()
    {
		$plus = $this->plus;
    	if( $plus + $this->now_page > $this->total_pages)
    	{
    		$begin = $this->total_pages - $plus * 2;
    	}else{
    		$begin = $this->now_page - $plus;
    	}
    	
    	$begin = ($begin >= 1) ? $begin : 1;
    	$return = '';
    	$return .= $this->first_page();
    	$return .= $this->up_page();
    	for ($i = $begin; $i <= $begin + $plus * 2;$i++)
    	{
    		if($i>$this->total_pages)
    		{
    			break;
    		}
    		if($i == $this->now_page)
    		{
    			$return .= "<a class='now_page'>$i</a>\n";
    		}
    		else
    		{
    			$return .= $this->_get_link($i, $i) . "\n";
    		}
    	}
    	$return .= $this->down_page();
    	$return .= $this->last_page();
    	return $return;
    }
    
    protected function show_3()
    {
    	$plus = $this->plus;
    	if( $plus + $this->now_page > $this->total_pages)
    	{
    		$begin = $this->total_pages - $plus * 2;
    	}else{
    		$begin = $this->now_page - $plus;
    	}    	
    	$begin = ($begin >= 1) ? $begin : 1;
    	$return = '总计 ' .$this->total_rows. ' 个记录分为 ' .$this->total_pages. ' 页, 当前第 ' . $this->now_page . ' 页 ';
    	$return .= ',';
    	//$return .= '<input type="text" value="'.$this->list_rows.'" id="pageSize" size="3"> ';
    	$return .= $this->first_page()."\n";
    	$return .= $this->up_page()."\n"; 
    	$return .= $this->down_page()."\n";
    	$return .= $this->last_page()."\n";
    	$return .= '跳到<select onchange="'.$this->ajax_func_name.'(this.value)" id="gotoPage">';
       
        for ($i = $begin;$i<=$begin+10;$i++)
        {
            if($i>$this->total_pages)
    		{
    			break;
    		}        	
    		if($i == $this->now_page)
    		{
    			$return .= '<option selected="true" value="'.$i.'">'.$i.'</option>';
    		}
    		else
    		{
    			$return .= '<option value="' .$i. '">' .$i. '</option>';
    		}        	
        }
    	 $return .= '</select>页';
		 $return .= '<script language="javascript">
		 function toPage(str){
			 var getthisUrl=location.href;
			 getthisUrl=getthisUrl.replace("p='.$this->now_page.'","p="+str);
			 location.href=getthisUrl;
			 }
		 </script>';
    	return $return;
    }
}

?>